id:A158197 - OEIS Search Results

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Expansion of (1-x^2*c(x)^4)/(1-4*x*c(x)^2), c(x) the g.f. of A000108.

+0
2

1, 4, 23, 140, 866, 5388, 33603, 209796, 1310510, 8188328, 51169094, 319779544, 1998527188, 12490460620, 78064190235, 487896926580, 3049340393430, 19058321475960, 119114304522450, 744463650984360, 4652895041524380 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Apply the inverse of the Riordan array (1/(1-x^2),x/(1+x)^2) to 4^n. Hankel transform is A070997.`
	CROSSREFS	`Cf. A090317, A158196.` `Sequence in context: A038723 A091640 A067110 this_sequence A038736 A091642 A162561` `Adjacent sequences: A158194 A158195 A158196 this_sequence A158198 A158199 A158200`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 13 2009`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research